(A) : At high pressures repulsive force become significant in gases
(R) : At high pressure gas molecules are almost in contact with each other

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Both (A) and (R) are correct and (R) is the correct explanation of (A)

Both (A) and (R) are correct but (R) is not the correct explanation of (A)

(A) is true but (R) is false

Both (A) and (R) are false

answer is A.

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Detailed Solution

At high pressures, the repulsive forces between gas molecules become significant because the molecules are more closely packed together.
As the pressure increases, the molecules are forced closer to each other, and their electron clouds begin to overlap, resulting in a repulsive force.
This repulsive force is due to the electrostatic interactions between the molecules and becomes increasingly significant as the distance between the molecules decreases.
As the pressure increases, the gas molecules are forced closer together, and at very high pressures, they are almost in contact with each other.
At this point, the intermolecular forces between the molecules become very strong, and the gas can no longer be treated as an ideal gas.
The molecules are so close together that they begin to interact strongly with each other, leading to deviations from ideal gas behavior.
Therefore, statement (R) is also correct.
So, both (A) and (R) are correct and (R) is the correct explanation of (A)

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